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What is the solution of 3 ≤ (x + 2)/5 ≤ 6?

Answer and explanation

Correct answer: 13 ≤ x ≤ 28

The governing concept is solving a compound inequality by applying the same operation to all three parts. Starting with 3 ≤ (x + 2)/5 ≤ 6, multiply every member by 5. Since 5 is positive, neither inequality sign changes, giving 15 ≤ x + 2 ≤ 30. Subtract 2 throughout the compound inequality to obtain 13 ≤ x ≤ 28. Therefore option A is correct, and both endpoints are included because the original signs are non-strict (≤). Option B stops after multiplication and fails to subtract 2; options C and D result from incorrect arithmetic or shifting the expression in the wrong direction. Substitution also checks the endpoints: x = 13 gives the left equality 3, while x = 28 gives the right equality 6, confirming the closed interval [13, 28].

Related tags

Compound InequalityLinear InequalityClosed IntervalFractionAlgebraic Solution Of Linear Inequalities In One VariableLinear InequalitiesMathematicsClass 11 Mcq

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